Usually a STATCOM is installed to support power system networks that have a poor power factor and often poor voltage regulation. It is based on a power electronics voltagesource converter. Various PWM techniques make selective harmonic elimination possible, which effectively control the harmonic content of voltage source converters. The distribution systems have to supply unbalanced nonlinear loads transferring oscillations to the DC-side of the converter in a realistic operating condition.... Topics: STATCOM, voltage source converter, selective harmonic elimination, adaptive neural controller,...
-byK.Vivekanandan1 , S.Neelavathi, S.Subhashree, G.Kavitha, and S.Kavitha
The concept of dynamic composition of Web services has been given major importance in the recent years. While there are many systems available to select the services with the highest QoS score, very little thought has been given to the fact of constructing a model which takes in the user’s rating of a service as a major input for selection. A robust system for fetching the most updated version of the selected services and selection of the services based on users’ ratings of the QoS values... Topics: Web Service selection, rating, updated services, aging factor
This paper investigates the problem of dynamic multiuser subchannel allocation in the downlink OFDM systems. In traditional TDMA or FDMA systems, resource allocation for each user is non-adaptively fixed. Since the subchannel allocations among the users are not optimized, a group of users is likely to suffer from poor channel gains resulting from large path loss and random fading. To resolve this problem a low-complexity adaptive subchannel allocation algorithm is proposed in this paper. By... Topics: OFDM, Sub-Channel, Multiuser, Variable Data Rate.
This paper deals with reduction of the transmission power usage in the wireless sensor networks. A system with FEC can provide an objective reliability using less power than a system without FEC. We propose to study LDPC codes to provide reliable communication while saving power in the sensor networks. As shown later, LDPC codes are more energy efficient than those that use BCH codes. Another method to reduce the transmission cost is to compress the correlated data among a number of sensor... Topics: LDPC codes, Distributed Source coding, Source Channel coding, iterative decoding algorithm, layered...
The new technique we proposed in this paper based on Hidden Markov Model in the field of post compression rate distortion algorithms certainly meet the requirements of high quality still images. The existing technology has been extensively applied in modern image processing. Development of image compression algorithms is becoming increasingly important for obtaining a more informative image from several source images captured by different modes of imaging systems or multiple sensors. The JPEG... Topics: JPEG 2000, Hidden Markov Model, Rate distortion, Scalability, Image compression, post compression
Generation Expansion Planning (GEP) is one of the most important issues in long-term power system planning. In from past, investigators noticed to GEP and supply of energy. In power system planning, generation expansion planning is performed for 5-yrears planning horizon or more. There are two main objective functions in GEP. First is the minimization of investment cost and another one is the maximization of reliability. GEP use future likeable engineering economics function, in order to... Topics: Combines Cycle Generation Technology (CCGT), Generation Expansion Planning (GEP), Load Dispatch...
This paper solves reliability constrained unit commitment problem (UCP) for a composite power system network using network equivalent technique. Here, the integration of generation and transmission system reliability forms a composite power system model. The inclusion of load forecast uncertainty for the solution of unit commitment problem will give more accurate assessment of spinning reserve (SR). Probabilistic techniques help in setting the reserve requirement which is defined by reliability... Topics: Composite generation and transmission system, Genetic algorithm, Load forecast uncertainty, Network...
The continued speed improvement of serial links and appearance of new communication technologies, such as ultra-wideband (UWB), have introduced increasing demands on the speed and power specifications of high-speed low-tomedium resolution analog-to-digital converters (ADCs).This paper presents the design of high speed and ultra low power comparator of a 4-bit ADC. The comparator used is Threshold Inverter Quantization (TIQ) consuming less than 145μW power with the input frequency of 1GHz and... Topics: SoC, CMOS, ADC, TIQ.
In this paper, we attempt to present a comparison through rigorous studies (existing conventional models) following software based modeling and verifications through simulations in terms of various traffic parameters such as packet loss, Recovery Time (Latency), reordering of packets including recovery time for various widely used path recovery models for the purpose of end-to-end recovery of LSPs inMPLS domains using NS2 simulator. Topics: MPLS .path -recovery, software modeling and simulations, traffic engineering, LSP (Label Switch...
One of the challenging issues in Spread-Spectrum Modulation (SSM) is the design of the Pseudo - Random or Pseudo - Noise (PN) sequence generator as an option to the already available methods. This work is related to the use of Artificial Neural Network (ANN) for generation of the PN sequence during transmission and reception of a SSM based system. The benefit of the ANN - assisted PN generator shall be that it will simplify the design process of the PN - generator and yet provide high... Topics: SSM, PN sequence, ANN, Rayleigh, Rician
Physical layout automation is very important in VLSI’s field. With the advancement of semiconductor technology, VLSI is coming to VDSM (Very Deep Sub Micrometer), and the scale of the random logic IC circuits goes towards million gates. Physical design is the process of determining the physical location of active devices and interconnecting them inside the boundary of the VLSI chip.The earliest and the most critical stage in VLSI layout design is the placement. The background is the rectangle... Topics: Placement problems, Memetic algorithm, wire length minimization, area minimization.
The phase frequency detector has been designed for high frequency phase locked loop in 180 nm CMOS Technology with 1.8V supply voltage using CADENCE Spectre tool. A Virtuoso Analog Design Environment and Virtuoso LayoutXL tools of Cadence have used to design and simulate schematic and layout of phase frequency detector respectively. Architecture of phase frequency detector (PFD) has simulated to get low dead zone and low power consumption. A layout has designed by above tool and DRC by Assura.... Topics: Phase locked loop (PLL), Phase frequency detector (PFD), Charge pump (CP), Voltage controlled...
Using the Mel-frequency cepstral coefficients (MFCC), Human Factor cepstral coefficients (HFCC) and their new parameters derived from log dynamic spectrum and dynamic log spectrum, these features are widely used for speech recognition in various applications. But, speechrecognition systems based on these features do not perform efficiently in the noisy conditions, mobile environment and for speech variation between users of different genders and ages. To maximize the recognition rate of speaker... Topics: MFCC, HFCC, HMM, HOAP-2
Nowadays high strength and high performance concrete are widely used in many civil engineering constructions. To produce them it is required to reduce the water/powder ratio and increase the binder content. Superplasticizers are commonly used to achieve the workability. Silica fume is one of the popular pozzolanas used in concrete to get imporved properties. The use of silica fume in conjuction with superplastisizers has become the backbone of high strength and high performance concrete. An... Topics: high strength concrete, high performance concrete, superplastcizer, silica fumeI.
Modern embedded systems are built around the soft core processors implemented on FPGA. The FPGAs being capable of implementing custom hardware blocks giving the advantage of ASICs, and allowing the implementation of processor platform are resulting in powerful Configurablesystem on chip(C-SoC)platforms. The Microchip’s PIC microcontroller is very widely used microcontroller architecture across various embedded systems. The implementation of such core on FPGA is very much useful in CSOC based... Topics: CPU, RISC, IP Core, IC, MXE, Xilix.
A key element to the success of any organization is the ability to continuously improve its business process performance. Efficient Business Process Redesign (BPR) methodologies are needed to allow organizations to face the changing business conditions. For a long time, practices for BPR were done case-by-case and were based on the insights and knowledge of an expert to the organization. It can be argued that efficiency, however, can further be achieved with the support of automatic process... Topics: Process Mining, Business Process Redesign, Business Process Management
Fast delay estimation methods, as compared to simulation techniques, are needed for incremental performance-driven layout synthesis. On-chip inductive and conductive effects are becoming predominant in deep submicron (DSM) interconnects due to increasing clock speeds; circuit complexity and interconnect lengths. Inductance causes noise in the signal waveforms, which can adversely affect the performance of the circuit and signal integrity. Elmore delay-based estimation methods, although... Topics: Moment, Delay calculation, Interconnect, RLCG, VLSI
ultralow power consumption requirement of low throughput applications needs to operate circuits in subthreshold region where subthreshold leakage current is used as active current for necessary computations. This paper investigates the impact of interconnect drivers on digital circuit performance in subthreshold region. In particular, we have investigates the performance of Si-MOSFET and CNFETs at 32nm deep submicron technology node. Performance Analysis is carried out for different... Topics: Subthreshold, Ultra-low power, CNFET, Monte- Carlo analysis.
Modern Enterprise Software Systems entail many challenges such as rapidly changing business scenario, increase in complexity, and shorter time to market and providing business agility without compromising on the quality. Ensuring productivity, quality, consistency, cost effective, reduced cycle time have become a mandate for the teams dealing with modern enterprise software systems. Fluent Interfaces is a powerful technique, which help in taming the programming complexities, reducing... Topics: Fluent Interfaces, Enterprise Software Systems, Application Programmable Interface (API). Domain...
This paper presents a study of harmonic filters design procedure to minimize harmonic distortion caused by a harmonic source such as drives. The non – linear load considered in this paper is six pulse rectifier load. Design and simulation procedure with respect to this load is explained in details. Several types of shunt harmonic filters are presented. Shunt filters are effective in minimizing voltage distortion caused by nonlinear loads in industrial power systems. Different alternatives of... Topics: Harmonics, passive shunt filters, single tuned filter, high pass filter, filter rating
In this paper, a novel technique is applied to detect fault in the transmission line using wavelet transform. Three phase currents are monitored at both ends of the transmission line using global positioning system synchronizing clock. Wavelet transform, which is very fast and sensitive to noise, is used to extract transients in the line currents for fault detection. Fault index is calculated based on the sum of local and remote end detail coefficients and compared with threshold value to... Topics: Wavelet transform, transmission line faults, power system protection, fault transients,...
This article presents a new current-mode multiplier/divider based on MO-CDTA (Multiple output current conveyor transconductance amplifier). The circuit description is very simple, its construction consists of only one MO-CDTA. Without external passive elements, theproposed circuit is then suitable for IC architecture. The PSpice simulation and experimental results are depicted, and agree well with the theoretical anticipation. From simulation results, the maximum power consumption is... Topics: multiplier/divider, current-mode, MO-CDTA
This paper presents design, implementation and validation of a PC based Prototype speaker recognition and verification system. This system is organized to receive speech signal, find the features of speech signal, and recognize and verify a person using voice as the biometric. The system is implemented to capture the speech signal from microphone and to compare it with the stored data base using filter-bank based closed-set speaker verification system. At first, the identification of the voice... Topics: Biometrics, voice recognition, feature extraction, finger print, MATLAB, auto correlation,...
A conventional motorized wheelchair has been fitted with sensors and programmed with an intelligent guidance system to efficiently maneuver itself automatically from one point to another in a facility equipped with a grid of sensors that provide the wheelchair with the basic map of its course. The device described in this paper has been conceptualized such that once the wheelchair is given information regarding the starting and stopping point in a controlled facility, the wheelchair with this... Topics: wheelchair, automatic, motorized, sensor aided, path finding
The image processing tools are extensively used on the development of new algorithms and mathematical tools for the advanced processing of medical and biological images. Given an MRI scan, first segment the tumor region in the MRI brain image and study the pixel intensity values. A detailed procedure using Matlab script is written to extract tumor region in CT scan Brain Image and MRI Scan Brain Image. MRI Scan has higher resolution and easier identification compare to CT scan Brain image. Fast... Topics: Magnetic Resonance Imaging, Fast Fourier Transform, Zero padded Transform and Windowed Fourier...
There is often a requirement to fabricate thin glass plates for prototyping purposes in a research lab. For example to make a prototype of an optic filter there is a need to fabricate a number of thin glass plates and in most moderately equipped optic research laboratory there is facility to etch these glass plates, but lacks instruments to measure its thickness. Our main purpose is to design a system which is cost friendly and is capable of measuring the thickness with a resolution lesser than... Topics: Thickness, Measurement, Electronic System, Optic Device, Michelson Interferometer
Scaling of metal-oxide-semiconductor transistors to smaller dimensions has been a key driving force in the IC industry. This work analysis the gate leakage current behavior of nano scale MOSFET based on TCAD simulation. The Sentaurus Simulator simulates the high-k gate stack structure of N-MOSFET for analysis purpose. The impact of interfacial oxide thickness on the gate tunneling current has been investigated as a function of gate voltages for a given equivalent oxide thickness (EOT) of 1.0... Topics: MOESFET, inelastic trap assisted tunnelling, gate tunneling current, High-k stack
Variable frequency transformer (VFT) is used as a controllable bidirectional transmission device that can transfer power between asynchronous networks and functionally is similar to back-to-back HVDC. This paper describes the basic concept of a New Model Variable Frequency Transformer (NMVFT). NMVFT is a new technology which is used for v/f control of induction motors. A digital simulation model of NMVFT and its control system are developed using MATLAB. The out power thus generated in v/f... Topics: Variable frequency transformer (VFT), Asynchronous, New Model Variable Frequency Transformer...
Due to increasing industrialization quantity of waste water is increasing at alarming rate while compositions of such waste are being more and more complex. Disposal of such waste must follow suitable treatments so that qualities of effluent for disposal follow requisite standards. Such Standards for effluent are discussed and a case study for a beverage producing plant is reported. Topics: industrial waste, eco-friendly disposal, effluent standards, law enforcement, waste minimization.
This paper presents 1-bit full adder cell in emerging technologies like FinFET and CNFET that operates in the moderate inversion region for energy efficiency, robustness and higher performance. The performance of the adder is improved by the optimum selection of important process parameters like oxide and fin thickness in FinFET and number of carbon nanotubes, chirality vector and pitch in CNFET. The optimized CNFET-based full adder (OP-CNFET) has higher speed, lower PDP (power-delay product)... Topics: Variability, power-delay product (PDP), moderate inversion region (MIR), optimized FinFET-based...
In the deregulated electricity market, each generating company has to maximize its own profit by committing suitable generation schedule termed as profit based unit commitment (PBUC). This article proposes a Parallel Particle Swarm Optimization (PPSO) solution to the PBUC problem. This method has better convergence characteristics in obtaining optimum solution. The proposed approach uses a cluster of computers performing parallel operations in a distributed environment for obtaining the PBUC... Topics: deregulated market, profit based unit commitment, particle swarm optimization, distributed...
The objective of this work is to propose an image denoising technique and compare it with image denoising using ridgelets. The proposed method uses slantlet transform instead of wavelets in ridgelet transform. Experimental result shows that the proposed method is more effective than ridgelets in noise removal. The proposed method is effective in compressing images while preserving edges. Topics: ridgelet, slantlet transform, image denoising, compression, huffman, edge
-byProf. Hapse Manik M., Dr. A.G. Thosar, Prof. Sanjay M. Shinde and Prof. Satish A. Markad
This paper analyzes the probability distribution of wind speed data recorded by Maharashtra Energy Development Agency (MEDA) wind farm at Ahmednagar (India). The main objective is to validate the wind energy probability by using probability distribution function (PDF) of available wind potential. The wind speed is measured with the help of three anemometers S30, S45, S60 placed at 30 m, 45 m, and 60 m height. Mean values are recorded and stored for every hour using a Data logger. For accounting... Topics: probability distribution function, weibull distribution, maximum likelihood, lognormal...
The sensor nodes in a wireless sensor network are normally microcontroller based which are having limited computational capability related to various applications. This paper describes the selection, specification and realization of a wireless sensor node using the field programmable gate array (FPGA) based architecture for an early detection of hazards (e.g fire and gas-leak ) in mines area. The FPGAs in it’s place are more efficient for complex computations in compare to microcontrollers,... Topics: Wireless Sensor Network (WSN), system on programmable chip (SOPC), FPGA
-byDebabrata Kumar Karmokar, Khaled Mahbub Morshed, Md. Selim Hossain and Md. Nurunnabi Mollah
Wideband low profile double Inverted-F antenna (DIFA) for 5.2/5.8 GHz WLAN and 5.5 GHz WiMAX applications by means of numerical simulation is presented. The antenna has compact size of 9×20 mm2 and provides a wide bandwidth of 2.1 GHz (4675 MHz~6775 MHz) which covers the 5.2/5.8 GHz WLAN and 5.5 GHz WiMAX applications. Moreover it has very high peak gain and lower gain variation within the 10 dB return loss bandwidth. The VSWR of DIFA varies from 1.0412 to 1.1960 within the antenna return loss... Topics: Inverted-F antenna (IFA), Double IFA (DIFA), Low profile antenna, WLAN, WiMAX.
Tall latticed steel towers are being pursued for the purpose of microwave transmission, T.V. transmission etc. Antennas are fixed at the top of the tower for transmission. The height of the towers may range from 50m to 250m. The structural form consists of latticed steel work, suitable bracing and suitable foundation for the tower legs. Usually bolted connections are provided for the joints. Mainly dead and wind loads are considered for the design of such towers. The I.S. Code  has given... Topics: Gust Pressures, Frequency, Resonance
High-power thyristors with direct light –triggering and integrated protection functions can be utilized advantageously for applications in which several thyristors are connected in series. This applies in particular to High-Voltage DC (HVDC) transmission, Static Var Compensation (SVC), converters for medium voltage drives, and also to certain pulse power applications. Recent progress in both device innovations and optimization of some application systems is reviewed in this article. Topics: HVDC, Light Triggering thyristors, SVC VLF and OWT.
In processes of the production chain of carbide inserts, such as unloading or packaging, the conformity test of the insert type is performed manually, which causes a statistic increase of errors due to monotony and fatigue of workers as well as the wide variety of insert types. A measuring method is introduced that automatically inspects the chipformer geometry, the most significant quality feature ofinserts. The proposed recognition approach is based on local energy model of feature perception... Topics: optical measurement, industrial image processing, testing and inspection, local energy, phase...
In this paper, a new algorithm for a high resolution Direction Of Arrival (DOA) estimation method for multiple wideband signals is proposed. The proposed method proceeds in two steps. In the first step, the received signals data is decomposed in a Toeplitz form using the first-order statistics. In the second step, The QR decomposition is applied on the constructed Toeplitz matrix. Compared with existing schemes, the proposed scheme provides several advantages. First, it requires computing the... Topics: array signal processing, uniform linear array, Wideband signal, Toeplitz matrix
This paper presents an alternative approach for the design of linear phase digital low pass FIR filter using Particle Swarm Optimization with Constriction Factor and Inertia Weight Approach (PSO-CFIWA). FIR filter design is a multimodal optimization problem. The conventional gradient based optimization techniques are not efficient for digital filter design. Given the filter specification to be realized, PSO algorithm generates a set of filter coefficients and tries to meet the ideal frequency... Topics: FIR Filter, PSO, GA, Optimization, Magnitude Response, Convergence, Low Pass Filter
In this paper, a new active snubber circuit is developed for PFC converter. This active snubber circuit provides zero voltage transition (ZVT) turn on and zero current transition (ZCT) turn off for the main switch without any extra current or voltage stresses. Auxiliary switch turns on and off with zero current switching (ZCS) without voltage stress. Although there is a current stress on the auxiliary switch, it is decreased by diverting it to the output side with coupling inductance. The... Topics: Power factor correction (PFC), soft switching (SS), ZCS, ZCT, and ZVT
Power system performance is affected by dynamic characteristics of hydraulic governor-turbines during and following any disturbance, such as occurrence of a fault, loss of a transmission line or a rapid change of load. Accurate modelling of hydraulic System is essential to characterize and diagnose the system response. In this article the mathematical modeling of hydraulic turbine is presented. The model is capable to implement the digital systems for monitoring and control replacing the... Topics: mathematical modeling, simulation, hydraulic turbine
In this paper, the security of Selective Encryptionin RSA based Singular Cubic Curve with Automatic Variable Key (AVK) for some well known attacks are analysed. It is proved that this cryptosystem is more secure than Koyama scheme from which the algorithm has been generated. The proposed cryptographic algorithm makes justified use of KoyamaSchemes. Koyama scheme is not semantically secure. The proposed Scheme is efficient and semantically secure public key cryptosystem based on Singular Cubic... Topics: Singular Cubic Curves, Koyama Public Key Cryptosystem (PKC), Automatic Variable Key (AVK), Semantic...
This work is about the analysis of dead time variation on switching losses in a Zero Voltage Switching (ZVS) synchronous buck converter (SBC) circuit. In high frequency converter circuits, switching losses are commonly linked with high and low side switches of SBC circuit. They are activated externally by the gate driver circuit. The duty ratio, dead time and resonant inductor are the parameters that affect the efficiency of the circuit. These variables can be adjusted for the optimization... Topics: PSpice Simulation, Resonant Gate Driver, Synchronous Buck Converter, Switching Losses
Variable Frequency Transformer (VFT) is a controllable bi-directional transmission device that can transfer power between asynchronous networks. It avoids both HVDC link and FACTS based power transmission control system. Basically, it is a rotatory transformer whose torque is adjusted in order to control the power flow. In this paper, a simulated model of VFT is used as a controllable bidirectionalpower transmission device that can control power flow through the connected asynchronous power... Topics: Variable frequency transformer (VFT), MATLAB, Asynchronous power systems, Power flow.
Due to aggressive scaling and process imperfection in sub-45 nm technology node Vt (threshold voltage) shift is more pronounced causing large variations in circuit response. Therefore, this paper presents the analyses of various popular 1-bit digital summing circuits in light of PVT (process, voltage and temperature) variations to verify their functionality and robustness. The investigation is carried with ±3ó process parameters and ±10% VDD (supply voltage) variation by applying Gaussian... Topics: Carbon nanotube field effect transistor (CNFET), transmission gate (TG), random dopant fluctuation...
In this work, the analysis and simulation work is proposed for the low-power (reduced subthreshold leakage) and high performance SRAM bit-cells for mobile multimedia applications in deep-sub-micron (DSM) CMOS technology. The sub-threshold leakage analysis of the P3 SRAM cell has been carried out. It has been observed that due to pMOS stacking and full supply body-biasing, there is a reduction of 70% and 86% in sub-threshold leakage current at VDD=0.8V and VDD=0.7V respectively as compared to... Topics: Sub-threshold Leakage, Standby Power, Stacking, Conventional SRAM cell, PP-SRAM, P3-SRAM
This paper proposes a genetic algorithm optimization technique for optimal placement of distributed generation in a radial distribution system to minimize the total power loss and to improve the voltage sag performance. Load flow algorithm and three phase short circuit analysis are combined appropriately with GA, till access to acceptableresults of this operation. The suggested method is programmed under MATLAB software. The implementation of the algorithm is illustrated on a 34-node radial... Topics: Distributed Generation, Line Loss, Voltage Sag, Genetic Algorithm, and Radial Distribution network
This paper gives an overview and analyzes the different existing anti spamming techniques both content based, non content based methods and a combination of the duo. It also suggests that a small change in one of the parameters in the fuzzy string matching method could be useful to produce better results. Topics: email, spam, computer forensics, fuzzy string match
When the flows in natural or man made channel sections exceed the main channel depth, the adjoining floodplains become inundated and carry part of the river discharge. Due to different hydraulic conditions prevailing in the river and floodplain of a compound channel, the mean velocity in the main channel and in the floodplain are different. This leads to the transfer of momentum between the main channel water and that of the floodplain making the flow structure more complex. Results of some... Topics: Over bank Flow, flow interaction, horizontal interface, Flow distribution, Velocity distribution,...